Data firm comScore released its latest search engine rankings today, showing that search leaders Google and Yahoo slightly increased their market share, while other engines held steady or fell.

Google, of course, retains overwhelming dominance, its market share rising to 63.1 percent from 62.9 percent in September — but since September marked a fall from August’s 63.0 percent share, there isn’t a clear pattern over the last couple of months. Still, Google is up 8.1 percent year-over-year, according to Silicon Alley Insider’s Nicholas Carlson.

Carlson also notes that the general trends aren’t great for Yahoo, despite its 0.3 percent month-over-month increase (and the fact that it’s the number one search engine in Japan). Numbers from both comScore and Nielsen, which released its report yesterday, show Yahoo’s share dropping in recent months — in Nielsen’s case, the numbers show a precipitous 12 percent fall since October of last year.

Overall, Americans conducted 12.6 billion searches on the core search engines last month, up 7 percent from September, according to comScore.

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